JPS58211513A - Cam shaft for internal-combustion engine - Google Patents

Abstract

PURPOSE:To provide a light rigid cam shaft by a method wherein at least a shaft part of the cam shaft integrally provided with the shaft part, cam part and journal part is formed to a cylinder of fiber reinforced resin. CONSTITUTION:This cam shaft is composed of a shaft part 1, two cam parts 2 and two journal parts 3 arranged near both ends of the shaft part 1. The cam part 2 and the journal part 3 are integrally connected by an adhesive agent to the shaft part 1. Said shaft part 1 is formed of a tubular shape by a filament winding process or winding of preparegged tape immersed with thermosetting resin. The fiber is arranged to direct in an axial direction and a circumferential direction of the shaft part 1 and at the same time to form a multi-layered structure helically wound in a direction inclined at a specified angle. The cam part 2 is of a carbon fiber reinforced resin and formed to have an anti-friction covering layer such as metal vopour coating etc., on the surface of cam.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightweight cam portion 11 foot of an internal combustion engine.

Conventionally, camshafts have generally been integrally formed by iron casting. For this reason, the conventional Nocom shaft has a heavy mackerel, so 1. The disadvantage was that it caused engine output loss. Therefore, in order to reduce the droop of the camshaft throat, when constructing the camshaft throat, the hollow shaft was bulge-formed, and an assembled cam part and throat were devised to connect the cam part and the hollow shaft. It is difficult to estimate the intensity and function of light beams.

The present invention was devised to overcome the first generation problem (-
, IIH reinforced resin, especially regulating the orientation direction of #aH
L, / This fiber-reinforced resin has high rigidity.
1, and completed the present invention.

4, the internal combustion engine of the present invention! The shaft is constructed coaxially and integrally with the shut part, and includes at least one knob part and at least b.
At least the shaft portion is cylindrical and made of fiber-reinforced resin.
There are 6 things.

The present invention will now be explained in detail with reference to the drawings.

FIG. 1 is a sectional view of a typical cam shut of the present invention. This cam part 1F throat has a cylindrical shaft part 1 made of fiber-reinforced resin, two cam parts 2 disposed coaxially with this seam part 1, and two cam parts 2 near the hook end. placed 2
The journal section 3 is made up of several journal sections 3. 1. The shut part 1 and the weak part 2a, and the shaft part 1 and the cylindrical part 3 of this h-Mushanoto are eventually joined inside the body with an adhesive.

The fiber part 1 is a filament made by winding a filament 1 degree thick or a thermosetting resin-impregnated fiber into a tubular shape. J3 and constant angle C: 5t? A multilayer structure oriented in the shape of a '! i: ・JC is here.

In particular, the layer with fibers in the shape of a hollow increases the torsional rigidity in the direction of constant rotation. Also, the stem and the culm (the culm into which the fibers are placed)
The bending rigidity of the part 1 is increased.1 Therefore, the helical angle of the fiber orientation is determined by taking into account the positional relationship between the manual part of the JJ machine to be used and the cam of the output/J part. It is desirable to define a combination of layers with different angular orientations and layers parallel to the axis.

Also, the stiffness of the C-shaft 78 portion 1 is increased or decreased depending on the magnitude of the required stress.

The cam portion 2 is preferably made of Keramix, such as hydrogen nitride, silicon carbide, and saponified zirconium. In addition, the cam portion 2 may be made of a highly abrasion-resistant reinforced resin (-). If further abrasion resistance is required, a wear-resistant liquid I layer may be formed on the cam surface by metal vapor deposition or the like. L) Good.

The seal portion 3 is preferably made of fiber-reinforced resin.

Similar to the JJ lx part 2, the t#N abrasion resistance is improved by using carbon fiber reinforced resin and further providing an abrasion resistant coating layer on the surface. /J arm part 2, or [if you put wIA miscellaneous reinforced resin C bamboo on the cytonol part 3,) r-nomento wine nok, 7-', f wine no 1 ring in the circumferential direction. It is preferable to make hγ mugs in which the fibers are oriented in the same direction, but injection molding, etc.
B-Also, the fiber is contained in a non-dum form (J, ・) (is used for this purpose.

Connection between shaft part 1 and cam part 2) 1 to part 1
The journal portion 3 is bonded to the journal portion 3 using a thermosetting resin adhesive. It is preferable to use a thermosetting resin with high heat resistance. Further, it is also good to use a thermosetting resin constituting the shaft portion 1.

In addition, it makes the bond even stronger! Kome, JJ Mubu, Jar
It is possible to provide the inner circumferential surface of the null portion with irregularities as shown in FIGS. 2 and 3. Further, the inner diameter of the inner peripheral surface may be changed.

In this case, the seam 1/throat part is located at the rear.
It is preferable that six concave and convex portions are formed corresponding to the concave and convex portions of the inner circumferential surface of the jar kol portion. Due to these irregularities, the connections 4J between the cytonodal part, the /Jmu part and the jarnor part,
The adhesive Lf J is added to the joint by mechanically engaging 4.

This lJ, unity goes further.

Reinforcing materials used in #jkOU reinforced resin include high-strength, elastic fibers, carbonated fibers, carbon fibers, silicone fibers, etc. Highly elastic fibers called inorganic fibers or liquid crystal fibers can be used.As resins, polyimide, 1-carbon resin, phenolic resin, unsaturated polyester resin, etc.
Thermosetting resins such as Suffle are good. J1 preferred combination of fiber and resin is a combination of script fiber and polyimide.

Incidentally, in order to increase the precision of the cam surface of the cam portion and the surface of the journal portion, it is preferable that these surfaces are finally subjected to weighting with a cam grinder.

The first method of manufacturing the camshaft of the present invention is to
The throat part, cam part, and di-knoll part are manufactured separately by molding and heat-hardening as individual parts. Taking into account heat shrinkage due to clumping (preferably made of ceramics), join the cam part and the seat throat part to the seat throat part, and apply adhesive (bonding). p-) The outer circumferential surface of the round part is sharply milled 41..1.

In the second h method, the ndrel L-(-21171 part is formed by Neunoment 1 twin f-ing, etc., and on top of that, the parts corresponding to the jJ-mu part and the zip-nor part are formed by filament winding, etc.). These are then put into a mold and heated to form and harden.After this, finishing is performed using a cam grinder in the same manner as in the first method.

In the third method, a heat-resistant tube such as a silicone rubber tube is used as a mandrel, and a portion that will become the shaft portion is formed on the mandrel using filament winding or the like. To this uncured 21,171 parts, 136 parts produced in the same manner as the first hFh and the cytonal part were added, and then L-sheet 4 was placed in the mold. Introduce D gas or liquid into the heat-resistant tube inside the mold, apply 7-drel W, and press the shaft part, 136 part, and journal part into the mold. Heat the resin to harden it. This 41 grinding machine (・surface finish is 1j.The pressure of the fluid is bKu,'
About cmt is sufficient. In this case, as noted in F, the cam part,
If unevenness is formed in the inner circumferential direction of the journal part (if there is
・The throat part is formed in a concave and convex shape corresponding to the concavities and convexities of the cam part and the jill part, making the bond between the two more complete1. unit!
l! The mechanical strength per cup is about 10 times higher, and the fatigue strength is 1.6 times higher. It also has a very low coefficient of linear expansion and good dimensional stability. It also has high corrosion resistance against vibration.

The camshaft of the present invention includes 1. Since the shaft portion of the camshaft is made of Mi11 reinforced resin, which has excellent mechanical strength, rigidity, and fatigue resistance, it becomes a camshaft with excellent mechanical properties such as rigidity and fatigue resistance. .

In addition, the cam part and the journal part are made of a ceramic material or a carbon-hydrocarbon IH, H composite material, which has good wear resistance, so it has excellent wear resistance and is lightweight.1. Compared to conventional metal C/formed camshafts, the camshaft is 1/2 to 11.3 Φ-(equal strength and rigidity). It is easy to change the design to high rigidity -4, but...) (Using the cam section and throat of the present invention, the opening and closing movement of the valve becomes more precise, and the engine performance improves by 1v.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a camshaft of an internal combustion engine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an example of a journal portion used in the camshaft of the present invention, and FIG. FIG. 3 is a plan view showing an example of a cam section used in a camshaft. 1...Shaft part 2...Cam part 3...Journal department Patent applicant Toyota Central Research Institute Co., Ltd. Agent Patent attorney Hiroshi Okawa Patent attorney 1 M Tani Shuben Tamaki 1 Akira Maruyama

Claims (4)

[Claims] (1) Consisting of a shaft part, at least one cam part and at least one di-tl-full part integrally constructed with the shaft part, at least the shaft part is reinforced with fibers. A camshaft II for an internal combustion engine characterized by being cylindrical and made of resin. (2) The height v-f portion is made of fiber-reinforced resin and is integrally adhered to the seat and foot portions. (3) The cam part is made of carbon fiber-reinforced resin, and the surface forming the cutter is coated with a wear-resistant liquid such as a sacrificial metal, and is physically connected to the shaft part (patent Kamushitonodo according to claim 1r#. (4) The cam system according to claim 1, in which the cam part is made of Shinomics and is integrally connected to the nose part.